code: def simple_index(self, request):
      return request.param
  
file_path: pandas/pandas/tests/indexes/test_datetimelike.py
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
label_desc: Use image node_id 1 for calling the TestDatetimeLike obj's underlying member method code with example usage: obj.simple_index(request) and returns: request